US5698603AExpiredUtility
Expandable styrene polymers containing recycled material
Est. expirySep 2, 2014(expired)· nominal 20-yr term from priority
C08J 2351/00C08J 9/20C08J 2325/04C08F 257/02
43
PatentIndex Score
8
Cited by
2
References
4
Claims
Abstract
The present invention relates to expandable styrene polymers containing recycled polystyrene, having a recycled material content of from 10 to 50% by weight, based on the total weight of the polystyrene, to which alkyldi(2-hydroxyethyl)amines have been added during the polymerization.
Claims
exact text as granted — not AI-modifiedWe claim:
1. A process for the preparation of an expandable styrene polymer which contains from 10 to 50% by weight, based on the total weight of the styrene polymer, of recycled polystyrene, in which the recycled polystyrene is dissolved in monomeric styrene and this solution being polymerized in aqueous suspension, wherein alkyldi(2-hydroxyethyl)amines are added to the reaction mixture after addition of the suspension stabilizer.
2. A process as claimed in claim 1, wherein from 50 to 1000 ppm of alkyldi(2-hydroxyethyl)amines have been added to the reaction mixture.
3. A process as claimed in claim 2, wherein additionally from 500 to 1000 ppm of a polyethylene wax have been added to the reaction mixture.
4. An expandable styrene polymer which contains from 10 to 50% by weight, based on the total weight of the styrene polymer, of recycled polystyrene and which contains an alkyldi(2-hydroxyethyl)amine and a polyethylene wax.Cited by (0)
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